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    Multiple Corrosion-Protection Systems for Reinforced-Concrete Bridge Components: Laboratory Tests

    Source: Journal of Materials in Civil Engineering:;2014:;Volume ( 026 ):;issue: 011
    Author:
    David Darwin
    ,
    Matthew O’Reilly
    ,
    JoAnn Browning
    ,
    Carl E. Locke
    ,
    Y. Paul Virmani
    ,
    Jianxin Ji
    ,
    Lien Gong
    ,
    Guohui Guo
    ,
    Jason Draper
    ,
    Lihua Xing
    DOI: 10.1061/(ASCE)MT.1943-5533.0000991
    Publisher: American Society of Civil Engineers
    Abstract: Techniques for making epoxy-coated reinforcement more corrosion resistant, including epoxies with increased adhesion to the steel; concrete with a decreased water cement ratio; concrete containing calcium nitrite or one of two organic corrosion inhibitors; bars with a primer coating containing microencapsulated calcium nitrite applied prior to epoxy application; and bars coated with zinc prior to epoxy application are compared based on the chloride content required to initiate corrosion and corrosion losses using the southern exposure and cracked beam tests. The coatings on all bars are penetrated prior to testing to simulate damage in the field. The results indicate that, even when damaged, conventional epoxy coatings result in much higher concrete chloride contents at corrosion initiation and much lower corrosion losses than exhibited by conventional reinforcement. A reduced water-cement ratio, corrosion inhibitors, and the primer coating containing microencapsulated calcium nitrite provide protection in uncracked but less or no protection in cracked concrete. The bars coated with zinc prior to epoxy application exhibit relatively high corrosion rates because of preferential losses to the zinc, and no improvement in corrosion performance is observed for epoxies with increased adhesion.
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      Multiple Corrosion-Protection Systems for Reinforced-Concrete Bridge Components: Laboratory Tests

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    http://yetl.yabesh.ir/yetl1/handle/yetl/67391
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    contributor authorDavid Darwin
    contributor authorMatthew O’Reilly
    contributor authorJoAnn Browning
    contributor authorCarl E. Locke
    contributor authorY. Paul Virmani
    contributor authorJianxin Ji
    contributor authorLien Gong
    contributor authorGuohui Guo
    contributor authorJason Draper
    contributor authorLihua Xing
    date accessioned2017-05-08T21:57:29Z
    date available2017-05-08T21:57:29Z
    date copyrightNovember 2014
    date issued2014
    identifier other%28asce%29nh%2E1527-6996%2E0000037.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/67391
    description abstractTechniques for making epoxy-coated reinforcement more corrosion resistant, including epoxies with increased adhesion to the steel; concrete with a decreased water cement ratio; concrete containing calcium nitrite or one of two organic corrosion inhibitors; bars with a primer coating containing microencapsulated calcium nitrite applied prior to epoxy application; and bars coated with zinc prior to epoxy application are compared based on the chloride content required to initiate corrosion and corrosion losses using the southern exposure and cracked beam tests. The coatings on all bars are penetrated prior to testing to simulate damage in the field. The results indicate that, even when damaged, conventional epoxy coatings result in much higher concrete chloride contents at corrosion initiation and much lower corrosion losses than exhibited by conventional reinforcement. A reduced water-cement ratio, corrosion inhibitors, and the primer coating containing microencapsulated calcium nitrite provide protection in uncracked but less or no protection in cracked concrete. The bars coated with zinc prior to epoxy application exhibit relatively high corrosion rates because of preferential losses to the zinc, and no improvement in corrosion performance is observed for epoxies with increased adhesion.
    publisherAmerican Society of Civil Engineers
    titleMultiple Corrosion-Protection Systems for Reinforced-Concrete Bridge Components: Laboratory Tests
    typeJournal Paper
    journal volume26
    journal issue11
    journal titleJournal of Materials in Civil Engineering
    identifier doi10.1061/(ASCE)MT.1943-5533.0000991
    treeJournal of Materials in Civil Engineering:;2014:;Volume ( 026 ):;issue: 011
    contenttypeFulltext
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